Outside Saint Peter's Basilica in Vatican City on Tuesday, a nun prayed. In the Sistine Chapel, cardinals were beginning their conclave to select the next pope.

Valdrin Xhemaj EPA /LANDOV

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Originally published on March 12, 2013 2:25 pm

Update at 2:43 p.m. ET. No Pope Today:

Black smoke just poured from the chimney above the Vatican. That means, as was expected, the cardinals did not choose a pope on the first vote of their conclave to name a successor to the now-retired Pope Benedict XVI. As the cardinals' ballots are burned, NPR's Sylvia Poggioli says, chemicals are added to a fire in a second stove to turn the smoke black if there's no pope elected and white if there is.

Now, if all goes as planned, the cardinals will vote again Wednesday. The next time to watch for smoke is 7 a.m. ET tomorrow. We'll keep an eye on what happens.

Update at 12:35 p.m. ET. The Doors Are Closed:

All those who can't vote for the next pope have been dismissed from the Sistine Chapel. So now, the 115 cardinals who are eligible begin their work.

Update at 11:30 a.m. ET. The Cardinals Are Entering The Sistine Chapel:

The last step in the process of choosing a new pope — the conclave of cardinals in the Vatican's Sistine Chapel — is underway. As you can see on the streaming coverage from the Vatican, the cardinals are heading into the chapel. If all goes as planned, we should see a puff of smoke from the Vatican's chimney — signalling that the cardinals have cast their first vote — around 2 p.m. ET.

If all goes as planned, the princes of the church (who NPR's Philip Reeves profiled on Morning Edition), will vote once Tuesday afternoon during their conclave in the Sistine Chapel. It's not expected that one candidate from their ranks will receive the two-thirds necessary (77 votes) to become pope. So it's likely that Tuesday evening in Rome (mid-afternoon along the East Coast of the U.S.) we'll see black smoke coming from a special chimney atop the Vatican — black is the signal that there's been a vote, but no decision; white smoke and bells chiming signal that a pope has been chosen.

As Phil explained Monday, in coming days the cardinals are expected to vote twice each morning and twice each afternoon until someone gets the two-thirds or more votes.

The conventional wisdom is that it may take several days for the cardinals to reach a decision. On Morning Edition today, NPR's Sylvia Poggioli said that while the cardinals won't be talking among each other and looking to build alliances while in the Sistine Chapel, they will almost surely "be busy murmuring in each others' ears over coffee and pasta" when they take breaks.

That murmuring "could be the key to creating new alliances" that lead to the selection of a pope, Sylvia added.

As for which cardinals are being most talked about as potential popes, Sylvia says they continue to include Italian Cardinal Angelo Scola, 71, and Cardinal Odilo Pedro Scherer, 63, of Brazil.

We'll be watching for news from Vatican City and will update as it comes.

There are, of course, many other stories about the conclave today and many other ways to monitor what's happening:

-- The BBC rounds up the news so far today here, and writes that the homily the cardinals heard today "was more measured in tone than the address given in 2005 by Cardinal Joseph Ratzinger before he became Pope Benedict, which featured a fiery attack on the 'dictatorship of relativism.' "